OEM Carrier High Pressure Switch 670/470 PSI for Model PH3ANA042000BBAA

This OEM high pressure switch (part# 312926-252) is the factory-specified safety control for the Carrier PH3ANA042000BBAA packaged HVAC system. The high pressure switch continuously monitors refrigerant circuit pressure and opens the control circuit if pressure exceeds the safe threshold — protecting the compressor from catastrophic damage. When this switch fails or trips without resetting, you'll typically experience nuisance lockouts, a compressor that won't energize, or fault codes indicating a high-pressure trip condition. Replacing the switch with a genuine OEM part ensures the system operates within factory-engineered safety limits.

• Specs: Cutout: 670 PSI | Cut-in (reset): 470 PSI | OEM Part Number: 312926-252 | Genuine Carrier factory part | Compatible with R-410A refrigerant systems
• OEM vs Generic: This is a genuine OEM Carrier switch manufactured to exact factory pressure setpoints. Aftermarket switches can carry wide pressure tolerances, potentially allowing unsafe operating conditions or nuisance trips that shorten compressor life.
• Install difficulty: 3/5 — Refrigerant circuit must be recovered before replacing a high pressure switch on a sealed system. Tools needed: manifold gauges, refrigerant recovery unit, adjustable wrench, multimeter. EPA 608 certification required for refrigerant handling. Always confirm the switch is the root cause before replacing — check for refrigerant overcharge, dirty condenser coils, or restricted airflow first.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH3ANA042000BBAA packaged unit. Verify your unit's model data plate and part number before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you purchase — no guesswork required.